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percpu: add __percpu sparse annotations to net

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Add __percpu sparse annotations to net.

These annotations are to make sparse consider percpu variables to be
in a different address space and warn if accessed without going
through percpu accessors.  This patch doesn't affect normal builds.

The macro and type tricks around snmp stats make things a bit
interesting.  DEFINE/DECLARE_SNMP_STAT() macros mark the target field
as __percpu and SNMP_UPD_PO_STATS() macro is updated accordingly.  All
snmp_mib_*() users which used to cast the argument to (void **) are
updated to cast it to (void __percpu **).

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: David S. Miller <[email protected]>
Cc: Patrick McHardy <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Vlad Yasevich <[email protected]>
Cc: [email protected]
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Tejun Heo 2010-02-16 15:20:26 +00:00 • committed by David S. Miller
commit 7d720c3e4f
22 changed files with 127 additions and 114 deletions
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16
net/xfrm/xfrm_ipcomp.c
View file

@ -30,12 +30,12 @@
struct ipcomp_tfms {
struct list_head list;
struct crypto_comp **tfms;
struct crypto_comp * __percpu *tfms;
int users;
};
static DEFINE_MUTEX(ipcomp_resource_mutex);
static void **ipcomp_scratches;
static void * __percpu *ipcomp_scratches;
static int ipcomp_scratch_users;
static LIST_HEAD(ipcomp_tfms_list);
@ -200,7 +200,7 @@ EXPORT_SYMBOL_GPL(ipcomp_output);
static void ipcomp_free_scratches(void)
{
int i;
void **scratches;
void * __percpu *scratches;
if (--ipcomp_scratch_users)
return;
@ -215,10 +215,10 @@ static void ipcomp_free_scratches(void)
free_percpu(scratches);
}
static void **ipcomp_alloc_scratches(void)
static void * __percpu *ipcomp_alloc_scratches(void)
{
int i;
void **scratches;
void * __percpu *scratches;
if (ipcomp_scratch_users++)
return ipcomp_scratches;
@ -239,7 +239,7 @@ static void **ipcomp_alloc_scratches(void)
return scratches;
}
static void ipcomp_free_tfms(struct crypto_comp **tfms)
static void ipcomp_free_tfms(struct crypto_comp * __percpu *tfms)
{
struct ipcomp_tfms *pos;
int cpu;
@ -267,10 +267,10 @@ static void ipcomp_free_tfms(struct crypto_comp **tfms)
free_percpu(tfms);
}
static struct crypto_comp **ipcomp_alloc_tfms(const char *alg_name)
static struct crypto_comp * __percpu *ipcomp_alloc_tfms(const char *alg_name)
{
struct ipcomp_tfms *pos;
struct crypto_comp **tfms;
struct crypto_comp * __percpu *tfms;
int cpu;
/* This can be any valid CPU ID so we don't need locking. */

6
net/xfrm/xfrm_policy.c
View file

@ -2428,19 +2428,19 @@ static int __net_init xfrm_statistics_init(struct net *net)
{
int rv;
if (snmp_mib_init((void **)net->mib.xfrm_statistics,
if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
sizeof(struct linux_xfrm_mib)) < 0)
return -ENOMEM;
rv = xfrm_proc_init(net);
if (rv < 0)
snmp_mib_free((void **)net->mib.xfrm_statistics);
snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
return rv;
}
static void xfrm_statistics_fini(struct net *net)
{
xfrm_proc_fini(net);
snmp_mib_free((void **)net->mib.xfrm_statistics);
snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
}
#else
static int __net_init xfrm_statistics_init(struct net *net)

3
net/xfrm/xfrm_proc.c
View file

@ -50,7 +50,8 @@ static int xfrm_statistics_seq_show(struct seq_file *seq, void *v)
int i;
for (i=0; xfrm_mib_list[i].name; i++)
seq_printf(seq, "%-24s\t%lu\n", xfrm_mib_list[i].name,
snmp_fold_field((void **)net->mib.xfrm_statistics,
snmp_fold_field((void __percpu **)
net->mib.xfrm_statistics,
xfrm_mib_list[i].entry));
return 0;
}